CN1188667C - Apparatus for measuring medium to be measured passing measuring tube - Google Patents
Apparatus for measuring medium to be measured passing measuring tube Download PDFInfo
- Publication number
- CN1188667C CN1188667C CNB001366122A CN00136612A CN1188667C CN 1188667 C CN1188667 C CN 1188667C CN B001366122 A CNB001366122 A CN B001366122A CN 00136612 A CN00136612 A CN 00136612A CN 1188667 C CN1188667 C CN 1188667C
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- CN
- China
- Prior art keywords
- electrode
- measuring tube
- test
- potential electrode
- potential
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
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Classifications
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
- G01F1/00—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow
- G01F1/56—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow by using electric or magnetic effects
- G01F1/58—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow by using electric or magnetic effects by electromagnetic flowmeters
- G01F1/60—Circuits therefor
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
- G01F25/00—Testing or calibration of apparatus for measuring volume, volume flow or liquid level or for metering by volume
- G01F25/10—Testing or calibration of apparatus for measuring volume, volume flow or liquid level or for metering by volume of flowmeters
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- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- General Physics & Mathematics (AREA)
- Measuring Volume Flow (AREA)
- Electromagnetism (AREA)
Abstract
The invention provides a measuring apparatus, for a volume flow rate, which can be used generally and which is low-cost or to provide an apparatus which discriminates the filling level of a measuring tube. At least one test electrode is installed in the upper region of the measuring tube. A test signal is sent out to the test electrode by an evaluation/control unit. By the evaluation/control unit, information regarding the filling state of the measuring tube is prepared on the basis of a response signal to the test signal received by a measuring electrode.
Description
The present invention relates to a kind of measurement at the flow through device of flow of testing medium of measuring tube of the axis direction of measuring tube, this device has a kind of magnetic texure, at least one potential electrode and calculating and control module that produces magnetic field, this magnetic field is passed measuring tube and is extended with respect to the axis of measuring tube substantially sidewards, this potential electrode be arranged in the side regions of measuring tube and electricity or electric capacity be connected to testing medium, the measuring voltage that this calculating and control module utilization are responded in potential electrode is provided at the volumetric flow rate information of the medium to be measured in the measuring tube.
Electromagnetic flowmeter utilizes the principle of electrodynamic induction to carry out the measurement of volumetric flow rate: the electric charge carrier with respect to the testing medium of magnetic field vertical ground motion produces voltage on potential electrode, and this potential electrode is similarly perpendicular to the flow direction setting of testing medium.This induced voltage and the mean flow rate of medium in the whole cross section of measuring tube to be measured are proportional; Therefore proportional with volumetric flow rate.
If measuring tube does not have to fill full but only partly is filled with medium to be measured, can produce sizable measuring error, yet this measurement mechanism is based on the measurement result that produces on the measuring tube that fills up fully.In order to eliminate this error source, a kind of such device is disclosed, the corresponding filling extent information that measuring tube is filled in this device consideration is determined volumetric flow rate.Therefore German utility model G9103046.3 has described a kind of electromagnetic flow-measurement device, independent drive arbitrarily or encourage two electromagnets jointly in measurement mechanism, and if common excitation could be at random excitation or on identical direction in opposite direction excitation.For measuring volumetric flow rate, at least two magnitudes of voltage that application is drawn by corresponding a pair of potential electrode, these two magnitudes of voltage are measured in the different foment (for example two electromagnets on identical direction and the excitation of opposite direction) at electromagnetic structure.The parameter determined by means of experience ground of computing unit is handled this measuring-signal to draw the flow rate output signal subsequently, has eliminated in this case owing to partly fill the error that measuring tube causes.Even for guaranteeing that at least one pair of potential electrode is electrically connected to testing medium and can be used in the generation measuring-signal under the low-down situation of measuring tube filling extent, the flow measurement device of describing in G9103046.3 has two pairs of potential electrode, a pair of in these two pairs of potential electrode be arranged on the measuring tube xsect above, another is to being arranged on the bottom.
In addition, following proposal is also disclosed in the prior art, except two potential electrode were arranged on the central area of measuring tube, in the upper area and every kind situation in another test electrode bottom section at measuring tube of a test electrode at measuring tube, the bottom test electrode is ground connection usually.The voltage of measuring on test electrode is as the filling extent of differentiating measuring tube, and the required volumetric flow rate information that flows through measuring tube can draw from the magnitude of voltage of measuring in potential electrode simultaneously.
For the known device that makes the filling extent of measuring measuring tube can use at large, the source resistance that is applied to the test voltage on the test electrode must be higher relatively (for example, 100k Ω the order of magnitude).The device of only measuring volumetric flow rate in this mode can be used for the large-scale testing medium that must comprise at large, and just as is known, the electric conductivity of these testing mediums differs greatly each other.
When be not use the promptly actual sensor of a kind of compact structure and electronic section all be contained in the housing but use so a kind of measurement mechanism promptly the sensor in this device be in this process, to be provided with and when being connected lead (normally concentric cable) and being connected to the conversion electron instrument of distant place, the defective of known solutions is obvious.This connection lead has produced the dividing potential drop of the length that depends on concentric cable, when the connection lead surpasses certain length, can not obtain measurable component of voltage again on test electrode at all.Therefore, the measurement mechanism of the filling extent of known identification measuring tube is only limited to and use-promptly can only be applied in certain scope in the compact device, and the connection lead that perhaps is applied between sensor and electronic instrument at a distance is no more than in about 10 meters device.
The present invention is based on such purpose, promptly provide a kind of and generally be suitable for and the device of the filling extent of measurement volumes flow that cost efficiency is worthwhile and/or identification measuring tube.
Realize this purpose by following mode, upper area at measuring tube provides at least one test electrode, calculating and control module are delivered to test electrode with test signal, signal with calculating and this test signal of control module application responds, receive said response signal by potential electrode, so that the information about the measuring tube filling extent to be provided.According to the present invention,, should " blank pipe detection " be meant that the identification measuring tube was complete filling or only partly filling or empty fully by test signal applications is realized so-called " blank pipe detection " to test electrode.If measuring tube has been filled, then said test signal shows as the response signal in potential electrode.On the other hand, if measuring tube is only partly filled or be empty, then between top test electrode and potential electrode, be not electrically connected or exist to disturb and be electrically connected.Therefore, on potential electrode, there is not the response signal of response signal or other decay to occur.
Though a potential electrode is just enough determined volumetric flow rate and identification " blank pipe detection " on principle, but also provide second potential electrode according to advantageous embodiments of the present invention, this second potential electrode is arranged in the zone of the measuring tube relative with first potential electrode.Two potential electrode preferably on the diametric(al) of the central area of measuring tube toward each other.
For the condition of utilizing symmetry with as the result's of this situation redundant measurement, with respect to two potential electrode test electrode is set in such a way, the distance of each electrode in two potential electrode is basic identical.Therefore the test signal by test electrode output produces essentially identical response signal on each electrode of two potential electrode.In this case if differ bigger, then this shows and breaks down under certain situation, and for example a potential electrode breaks down.
Favourable further scheme according to device of the present invention provides second test electrode, this second test electrode and first test electrode on diameter substantially vis-a-vis, first test electrode preferably is arranged on the summit of measuring tube, and second test electrode preferably is arranged on the minimum point of measuring tube.According to a test electrode ground connection in two test electrodes of a kind of further modifying device of the present invention.The test electrode of ground connection preferably is arranged on the electrode in the bottom section of measuring tube.As noted above, be not absolute demand as second test electrode of reference electrode.Ground plate (grounding disk) also can be used as reference potential, and said plate is for example to be formed on the flange that is used for flow measurement device is fixed on piping system.
Preferred version suggestion test signal according to device of the present invention is the pulse signal of symmetry.This embodiment has advantage with respect to asymmetrical signal arbitrarily: promptly can produce electrochemical potential in testing medium relative to the energy density of higher test signal under the situation of asymmetrical signal and move.Test event signal is designed to the pulse of symmetry, and then potential shift is on a rough average is zero.
Provide a kind of calculating and control module according to the preferred embodiment of device of the present invention, this calculating and control module are to carrying out relevant with the response signal on a said potential electrode/a plurality of potential electrode with test signal at test electrode.This is whether a kind of response signal of discerning test signal appears at the simple and reliable method on a said potential electrode/a plurality of potential electrode.
In addition, favourable further scheme according to device of the present invention, provide a kind of by will test electrode and/or on a potential electrode/a plurality of potential electrode measured response signal and predetermined reference signal compare, determine the calculating and the control module of compactedness information.Under current process and system condition, in different measuring processes, determine these reference signals respectively in advance.Tolerances in design in relevant device thus, and make them less relatively, its result can improve the quality of measurement, therefore can realize discerning reliably the measuring tube of non-complete filling.
Preferred version according to device of the present invention provides a kind of storage unit, and preferred reference signal is stored in this storage unit.
Explain the present invention in more detail with reference to following accompanying drawing, in the accompanying drawings:
Accompanying drawing 1 is depicted as the synoptic diagram according to first embodiment of device of the present invention,
Accompanying drawing 3 is depicted as the relevant driving calculating and the process flow diagram of control module.
Accompanying drawing 1 is depicted as the synoptic diagram according to first embodiment of device of the present invention, and accompanying drawing 2 is depicted as the synoptic diagram according to second embodiment of device of the present invention.Main difference in two embodiment is only to have a potential electrode 4 and a test electrode 6 in first embodiment, and first potential electrode 4 and second potential electrode 5 and first test electrode 6 and second test electrode 7 are arranged in a second embodiment.
In each embodiment of two embodiment, medium 11 to be measured is at the measuring tube 2 of the direction upper reaches of the axis 10 of measuring tube inflow-rate of water turbine meter (attached not shown in the figures at this).Medium 11 to be measured is to conduct electricity slightly at least.Measuring tube 2 itself is made by non-conducting material, or is the liner that is added with non-conducting material in its inside at least.
Because magnetic field is perpendicular to the flow direction of medium to be measured 11 and usually by producing at two magnets that are provided with on the diametric(al) (not seeing equally in this accompanying drawing), charge carrier migration in testing medium 11 is on potential electrode 4 or relative potential electrode 4,5.On the potential electrode 4 or proportional with the mean flow rate of medium to be measured 11 in the xsect of measuring tube 2 at the voltage that produces on the potential electrode 3,4, it is measuring the volumetric flow rate of the medium to be measured 11 in measuring tube 2 in other words.Incidentally, measuring tube 2 process Connection Elements for example flange are connected to the piping system that medium to be measured 11 flows through, and Connection Element is not shown in the accompanying drawings.
Shown in two situations in, potential electrode 3,4 all directly and medium to be measured contact; Yet as indicated above, connecting also can be capacitive connection.
Foundation device 1 of the present invention is preferably according to following operation: calculating and control module 8 are with preset time interval t
MTest signal is delivered to test electrode 6.The pulse of the preferred symmetry of test signal.Explain that as mentioned the potential fluctuation of responding to is on a rough average at least to be zero in medium to be measured 11 when applying the test signal of constructing symmetrically.Therefore volume flow measurement almost is not subjected to the interference of process of the filling extent of the identification measuring tube 2 that superposeed.
If medium to be measured 11 is located between test electrode 6 and potential electrode 4 or the potential electrode 4,5, the test signal that is delivered to test electrode 6 is in potential electrode 4 or signal appearance in response on potential electrode 4,5.Calculating and control module 8 preferably pass through in test signal and carry out related operation and determine response signal between the response signal on the corresponding potential electrode 4,5.
Testing medium 11 and other external system and measuring process situation be the reliability of greatly influence foundation device 1 final measurement volumes flow of the present invention all.Therefore, a kind of definite test signal for example is delivered to test electrode 6 under system that determines and measuring process situation under the situation of complete filling measuring tube 2.On potential electrode 4 or potential electrode 4,5, measure corresponding response signal respectively.Measured response signal is stored in the storage unit 10 as the benchmark response signal or as desirable response signal.The response signal of all reality of being measured subsequently all compares with this benchmark response signal.If actual response signal is in the predetermined tolerance Δ around the desirable response signal, then this shows that the measurement of mass flowrate is to carry out in the measuring tube 2 of complete filling.On the other hand, if actual response signal is outside the predetermined tolerance Δ around the desirable response signal, then calculating and control module 8 for example do not have complete filling full by I/O unit notification operator measuring tube 2.
On program point 18, begin measurement/calculation procedure.By means of timer (program point 19) and time inquiry (program point 20), at preset time t
MAfterwards, at program point 21 determined test signal is delivered to test electrode 6.In the response signal of measuring on the program point 22 at least one potential electrode 4,5.If within the predetermined tolerance Δ of actual response signal around desirable response signal, then calculate according to desirable state by calculating and control module 8.At preset time t
MRepeatedly carry out corresponding program point subsequently afterwards.If the measurements and calculations at program point 22,23 show actual response signal outside the predetermined tolerance Δ around the desirable response signal, then do not have the compactedness of defined measuring tube 2 for operator's indication measurement pipe 2 by I/O unit 10.
The reference number inventory
1 according to device of the present invention
2 measuring tubes
3 measuring tube axis
4 first potential electrode
5 second potential electrode
6 first test electrodes
7 second test electrodes
8 calculate and control module
9 output/input blocks
10 storage unit
11 testing mediums
12 connect lead
13 connect lead
14 connect lead
15 connect lead
16 connect lead
17 connect lead
Claims (11)
1. a measurement is at the flow through device of flow of testing medium of measuring tube of the axis direction of measuring tube, wherein the upper area at measuring tube (2) provides at least one test electrode, this device has a kind of magnetic texure that produces magnetic field, this magnetic field is passed measuring tube and is extended with respect to the axis of measuring tube substantially sidewards, it is characterized in that comprising at least one potential electrode and calculating and control module, this potential electrode be arranged in the side regions of measuring tube and electricity or electric capacity be connected to medium to be measured, this calculating and control module are applied in the volumetric flow rate information that the measuring voltage of responding in the potential electrode is provided at the testing medium in the measuring tube, calculating and control module (8) are delivered to test electrode with test signal, and calculating and control module (8) response signal of using this test signal provides the information about the filling extent of measuring tube (2), and said response signal receives by said potential electrode.
2. second potential electrode that provides in the zone of first potential electrode and the measuring tube (2) relative with this first potential electrode is provided for the device described in claim 1, wherein said potential electrode.
3. as at the device described in the claim 2, wherein said first potential electrode and second potential electrode in the central area of measuring tube (2) on diameter toward each other.
4. as the described device of claim 1,2 or 3, wherein test electrode is provided with like this with respect to two potential electrode: the distance of each potential electrode in two potential electrode of distance is basic identical.
5. as claim 1,2 or 3 described devices, wherein said test electrode comprises first test electrode and second test electrode, and this second test electrode and first test electrode substantially on diameter vis-a-vis, first test electrode preferably is arranged on the summit of measuring tube (2), and second test electrode preferably is arranged on the minimum point of measuring tube (2).
6. as the described device of claim 1,2 or 3, one of them test electrode ground connection.
7. device as claimed in claim 1, wherein test signal is the pulse of symmetry.
8. the device of stating as claim 1 or 7 wherein calculates and control module (8) will carry out correlation computations in response signal on test electrode and/or the potential electrode and test signal.
9. as claim 1 or 7 described devices, wherein calculate and control module (8) by will be in test electrode and/or measured response signal and predetermined reference signal compare definite measuring tube (2) on potential electrode compactedness information.
10. device as claimed in claim 9, wherein predetermined reference signal are to measure with the filling extent that measuring tube (2) is determined, and are the functions of corresponding particular process parameter.
11. device as claimed in claim 9 wherein is provided for storing the storage unit (10) of predetermined reference signal.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| EP99124977.2 | 1999-12-15 | ||
| EP99124977A EP1108989B1 (en) | 1999-12-15 | 1999-12-15 | Device for measuring the throughput of a measuring fluid in a measuring tube |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1299962A CN1299962A (en) | 2001-06-20 |
| CN1188667C true CN1188667C (en) | 2005-02-09 |
Family
ID=8239613
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB001366122A Expired - Fee Related CN1188667C (en) | 1999-12-15 | 2000-12-15 | Apparatus for measuring medium to be measured passing measuring tube |
Country Status (5)
| Country | Link |
|---|---|
| EP (1) | EP1108989B1 (en) |
| JP (1) | JP3679708B2 (en) |
| CN (1) | CN1188667C (en) |
| AT (1) | ATE352769T1 (en) |
| DE (1) | DE59914171D1 (en) |
Families Citing this family (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE10335205A1 (en) * | 2003-07-30 | 2005-02-17 | Endress + Hauser Flowtec Ag, Reinach | Method for the magnetic-inductive determination of the flow rate of a medium |
| US7093500B2 (en) * | 2003-12-12 | 2006-08-22 | Rosemount Inc. | Tunable empty pipe function |
| DE102006026772A1 (en) * | 2006-06-07 | 2007-12-13 | Endress + Hauser Flowtec Ag | Method and device for determining the volume or measurement flow |
| EP2283325B1 (en) * | 2008-06-05 | 2020-09-02 | Siemens Aktiengesellschaft | Electromagnetic flowmeter and method with full pipe detection by the help of a third electrode |
| WO2010088921A1 (en) | 2009-02-04 | 2010-08-12 | Siemens Aktiengesellschaft | Electromagnetic flowmeter having corrosion protection of measuring electrodes, and method incorporating the same |
| DE102009002539A1 (en) | 2009-04-21 | 2010-10-28 | Endress + Hauser Flowtec Ag | Magnetic-inductive flow measuring device and method for operating the same |
| DE102013013991A1 (en) * | 2013-07-08 | 2015-01-08 | Krohne Messtechnik Gmbh | Magnetic-inductive flowmeter |
| CN105318919B (en) * | 2014-07-10 | 2020-02-28 | 恩智浦有限公司 | Flow sensor |
| CN106092278A (en) * | 2016-07-22 | 2016-11-09 | 蚌埠大洋传感系统工程有限公司 | A kind of flow transducer intelligent checking system |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DK0451308T3 (en) * | 1990-04-09 | 1995-03-27 | Fischer & Porter Gmbh | Circuit arrangement for measuring the flow of a liquid containing electrical charges |
| DK0548439T3 (en) * | 1991-12-18 | 1996-02-19 | Flowtec Ag | Switching device for operating multiple magnetically inductive flow sensors for a single electronic evaluation unit |
| DE4330290A1 (en) * | 1993-09-07 | 1995-03-09 | Fischer & Porter Gmbh | Device for measuring the current of a liquid flowing through a measuring tube |
| DE19637716C1 (en) * | 1996-09-16 | 1998-04-02 | Bailey Fischer & Porter Gmbh | Magnetic inductive flow measurement method for medium passing through measuring tube |
-
1999
- 1999-12-15 DE DE59914171T patent/DE59914171D1/en not_active Expired - Lifetime
- 1999-12-15 AT AT99124977T patent/ATE352769T1/en not_active IP Right Cessation
- 1999-12-15 EP EP99124977A patent/EP1108989B1/en not_active Expired - Lifetime
-
2000
- 2000-12-13 JP JP2000379302A patent/JP3679708B2/en not_active Expired - Fee Related
- 2000-12-15 CN CNB001366122A patent/CN1188667C/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| EP1108989A1 (en) | 2001-06-20 |
| DE59914171D1 (en) | 2007-03-15 |
| ATE352769T1 (en) | 2007-02-15 |
| EP1108989B1 (en) | 2007-01-24 |
| JP2001183194A (en) | 2001-07-06 |
| JP3679708B2 (en) | 2005-08-03 |
| CN1299962A (en) | 2001-06-20 |
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